"I want them to connect to your headphones and tell you to keep right down a specific corridor that connects Bank with Monument, and to make sure you’re lined u

"I want them to connect to your headphones and tell you to keep right down a specific corridor that connects Bank with Monument, and to make sure you’re lined up perfectly for the exit to your platform. I don’t need to use it myself, I just need all my fellow commuters to be made to!" Yandex.Metro does it for some metros, minus the headphones part. You also do not want everybody to get same directions because it will make congestion worse.